Question

Ajutati-ma va rog la exercitiul asta

Answer 1

Răspuns:

Explicație pas cu pas:

a) x+1=7, x∈N  ⇒x=7-1  ⇒x=6

b)  x-2=-3, x∈Z  ⇒x=-3+2  ⇒x=-1

c) 3,25+x=1,65; x∈Q  ⇒325/100-x=65/100  ⇒325/100-165/100=x  ⇒160/100=x  ⇒x=16/10  ⇒x=8/5

d) 13,2-x=0,65, x∈Q  ⇒132/10-x=65/100  ⇒132/10-65/100=x  ⇒

(1320-65)/100=x  ⇒x=1255/100  ⇒x=251/20

e) x·3=-6, x∈Z  ⇒x=-6:3  ⇒x=-6

f) (-8):x=-4, x∈Z  ⇒x=(-8):(-4)  ⇒x=2

g) x:1,1=3; x∈R  ⇒x=1,1·3  ⇒x=3,3

e) x-2=-3, x∈Z

h) 1,2:x=3, x∈Q